Defect-tolerant aligned dipoles within two-dimensional plastic lattices

John C. Thomas, Jeffrey J. Schwartz, J. Nathan Hohman, Shelley A. Claridge, Harsharn S. Auluck, Andrew C. Serino, Alexander M. Spokoyny, Giang Tran, Kevin F. Kelly, Chad A. Mirkin*, Jerome Gilles, Stanley J. Osher, Paul S. Weiss

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Carboranethiol molecules self-assemble into upright molecular monolayers on Au{111} with aligned dipoles in two dimensions. The positions and offsets of each molecule's geometric apex and local dipole moment are measured and correlated with sub-Ångström precision. Juxtaposing simultaneously acquired images, we observe monodirectional offsets between the molecular apexes and dipole extrema. We determine dipole orientations using efficient new image analysis techniques and find aligned dipoles to be highly defect tolerant, crossing molecular domain boundaries and substrate step edges. The alignment observed, consistent with Monte Carlo simulations, forms through favorable intermolecular dipole-dipole interactions.

Original languageEnglish (US)
Pages (from-to)4734-4742
Number of pages9
JournalACS nano
Issue number5
StatePublished - May 26 2015


  • carborane
  • defect tolerant
  • dipole alignment
  • ferroelectric
  • nanoscience
  • scanning tunneling microscopy
  • self-assembled monolayer
  • self-assembly
  • two-dimensional

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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